The surface rupture associated with the April 2011 Fukushima-ken Hamadōri earthquake in northeast Japan:

Preliminary report of fault outcrop observation and borehole survey at Shionohira, Tabito Town, Iwaki City

Abstract

We study normal-fault surface rupture associated with the 2011 Fukushima-ken Hamadōri earthquake (Mj 7.0) along the Shionohira fault, Iwaki City. This preliminary report describes the results of observation of the surface rupture (with maximum vertical offset of c.a. 2.2 m), fault outcrop, and borehole sample obtained across the Shionohira fault. We observed row of col, fault-scarp, and fracture zone includes the conglomerate along the Shionohira fault. The borehole sample indicates angular unconformity in the hanging wall of the normal fault in the Manguro area. These results suggest cumulative deformation of the Shionohira fault.